On-chip image-processing algorithm for real-time CCD-based star trackers and wavefront sensors

Details On-chip image-processing algorithm for real-time CCD-based star trackers and wavefront sensors On-chip image-processing algorithm for real-time CCD-based star trackers and wavefront sensors

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..523c&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 699, p. 523-531

Astronomy and Astrophysics

Astronomy

1

Algorithms, Ccd Star Tracker, Charge Coupled Devices, Computer Programs, Image Processing, Software Tools, Wave Fronts, Angular Resolution, Atmospheric Correction, Atmospheric Effects, Atmospheric Turbulence, Seeing (Astronomy)

Scientific paper

In this paper, we describe on-chip and off-chip image-processing algorithms utilizing the internal architecture of recently developed CCD sensors to provide high-speed readout of selected portions of the imager or accelerated scanning of an entire CCD frame. Image-processing time comparable to the star-tracker sensor exposure time and to the characteristic time of the atmospheric fluctuations (10 ms) has been achieved. On-chip image processing is particularly suitable for space or ground-based real-time applications (position determination, tip-tilt correctors, wavefront sensing for adaptive optics systems) where the speed of acquisition and processing data from the 'regions of interest' is critical. An example of a star tracker (based on the Texas Instruments TC217 CCD image sensor) for space applications capable of providing real-time multiple position updates with high angular resolution is given and achieved performance is discussed.

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